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antiseptic1488 [7]
2 years ago
14

BRAINLIEST

Chemistry
2 answers:
pogonyaev2 years ago
6 0

Answer:

1st opt.

(copper is the only material consisting of a single pure substance)

Explanation:

an element is made up of only one type of atom, and copper (Cu) as you can see is a single pure atom whereas salt (NaCl) and vinegar (C2H4O2) are both made of different elements.

Hope this helps

lesantik [10]2 years ago
5 0

Answer:

copper is the only material composed of a single pure substance

Explanation:

plss mark brainliest

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I would like some assistance
charle [14.2K]

Answer:

#2.

Explanation:

Look at the charges. Both are positive, therefore both are cations.

6 0
2 years ago
True or false
sweet-ann [11.9K]

Answer:

True.

But it only changes in physical change.

How?

Explanation:

The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance.

In a physical change, a substance's physical properties may change.

A chemical change is a permanent change. A Physical change affects only physical properties i.e. shape, size, etc. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

Hope this helps!

8 0
3 years ago
How can I find the answer for this ?
12345 [234]
For what? what is your question 
7 0
3 years ago
How many moles of KBr are present in 500 ml of a 0.8 M KBr solution?
faltersainse [42]

Answer:

2) 0.4 mol

Explanation:

Step 1: Given data

  • Volume of the solution (V): 500 mL
  • Molar concentration of the solution (M): 0.8 M = 0.8 mol/L

Step 2: Convert "V" to L

We will use the conversion factor 1 L = 1000 mL.

500 mL × 1 L/1000 mL = 0.500 L

Step 3: Calculate the moles of KBr (solute)

The molarity is the quotient between the moles of solute (n) and the liters of solution.

M = n/V

n = M × V

n = 0.8 mol/L × 0.500 L = 0.4 mol

4 0
3 years ago
What evidence would support Maria's claim that the fossilized remains are that of a bird, class Aves, instead of a turtle, class
lora16 [44]

Your answer would be C.

6 0
3 years ago
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